Honeywell SYA14 Series, Руководство пользователя

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107004-15 EN FR26 ROW 0899 Printed in France 15
2. Description and Operation
2.1 Overview
This chapter contains terms and concepts related to safety and the application of the FF-
SRM muting module. The importance of the installer’s role in the set-up and installation of
the machine guarding systems is discussed. The section also contains specification
information.
2.2 Muting function
The FF-SRM module is an interface between the safety ESPE and the control circuitry of a
dangerous machine, on which the muting of the protective equipment outputs is necessary
at certain steps of the process. For example, on a machine automatically fed by a
conveyor, parts must be vehiculed through the detection field of the safety light curtain
towards the dangerous area without causing the immediate stoppage of the machine.
Similarly, manual loading and unloading of a press may be allowed while the press tool
goes back to its upper position.
The FF-SRM module is a permanently self-checked electrical interface which complies with
the requirements of the EN 954 -1European standard for category 4 protective devices :
any failure is immediately detected and prevents any muting sequence from being
activated. Connected with any of the ESPE from the Honeywell range, the FF-SRM module
reliably controls muting sequences.
When the protective equipment is not muted, the FF-SRM module output status is identical
to the light curtain output status, and the intrusion of an object or a person inside the ESPE
detection field immediately stops the machine. The machine can only restart after pressing
a restart push-button connected to the FF-SRM module terminals.
The muting sequence is controlled by two or four regular sensors (such as photoelectric
controls, limit switches or inductive proximity sensors) which reliably detect the
manufactured parts initiating and interrupting the muting sequence. When sequence
conditions are met, the FF-SRM module allows the machine to operate during the muting
sequence without taking into account the signal delivered by the ESPE. Correct operation
of the sensors is monitored at each muting sequence and any sensor failure prevents the
muting from being performed. If manufactured parts remain accidentaly in the light curtain
detection field during a muting sequence, two push-buttons allow the override of the light
curtain and restart of the machine is easily achieved. A white lamp informs the operator of
each muting sequence. Correct operation of this lamp is controled in accordance with
IEC/EN 61496-1 European standard, and any muting lamp failure prevents the muting from
being performed.
A Final Switching Device monitoring loop is available for the control of the relays
commanded by the two fail-safe static outputs of the module. The module also integrates
an alarm output (or « Secondary Switching Device ») which switches off in case of internal
failure, and signalling static outputs status indicator located on the module cover. These
LED status indicators provide the operator with information on the output status, on the
occurrence of a muting sequence, on a possible internal failure and warn the operator
when a manual restart of the module is necessary.